Merge pull request #233 from ruby-go-gem/doc_require_ruby_version

Write required versions in doc

Author: sue445

README.md

@@ -14,8 +14,8 @@
 | [/_gem/](/_gem/) | [go_gem](https://rubygems.org/gems/go_gem) (Ruby gem) | https://ruby-go-gem.github.io/go-gem-wrapper/            |
 
 ## Requirements
-* Go
-* Ruby
+* Go 1.23+
+* Ruby 3.3+
 
 ## Getting started
 At first, patch to make a gem into a Go gem right after `bundle gem`

_tools/patch_for_go_gem/README.md

@@ -1,6 +1,10 @@
 # patch_for_go_gem
 Patch to make a gem into a Go gem right after `bundle gem`
 
+## Requirements
+* Go 1.23+
+* Ruby 3.3+
+
 ## Usage
 1. Download [patch_for_go_gem.rb](patch_for_go_gem.rb)
 2. Run `bundle gem <GEM_NAME> --ext=c`